"My brother's giant genitals make me wonder if we have the same father"

This made me laugh so much... A young man wrote to "Dear Prudence," saying that his brother's "giant genitals" made him doubt that they had the same father. Apparently, the three brothers (now adults) and their father ended up taking a shower in a public situation and had never seen one another naked. The youngest brother had noticeably different "equipment"... but the hilarious part is Prudence's answer. Here it is:

Dear No,
It&#8217;s the Johnson brothers, Willie, Peter, and Rod! You and your brother got quite an eyeful of baby bro&#8217;s one-eyed wonder. I wish I knew what you meant by the superior &#8220;complexion&#8221; of your brother&#8217;s endowment. I&#8217;m just supposing that his Moby-Dick gives off a rosy glow due to excess blood flow. There are several ways to approach your central question: Did your mother give your father the shaft? First of all, you seem to be of the opinion that sexual characteristics are inherited only from the parent of the same sex. But as this website points out, genital size, like eye color and height, are traits inherited from both parents. It&#8217;s perfectly possible that your mother comes from a family of three-legged men and you and your older brother got the short end of that genetic lottery. You have one ambiguous (though substantial) piece of evidence for your theory that your parents&#8217; divorce was due to your mother&#8217;s infidelity. But maybe your mother discovered that while she was gestating your father&#8217;s third son, he was the one cheating on her. Despite the nastiness of your parents&#8217; parting, they have kept the reason quiet all these years. Since all of you boys appear to have been happily incurious about their split these many years, it&#8217;s probably a good idea to remain that way. You want to establish that your baby brother isn&#8217;t really a member of the tribe. But pursuing your hunch will only make a cock-up of things because nothing can change the fact that your father has always embraced all of you as his three sons.